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Working from inside, spin the vent brush a few inches into the duct leading outside, then pull it back and clean off the bristles. Repeat until the bristles reach as far as the exhaust hood on the outside wall. (Don't try to shove the lint out with the brush; you may create a clog.) Then go outside and make sure the vent hood isn't plugged. If need be, remove the hood, clean it out, and then put it back.